Brake adjusting tool



Dec. 28, 1937. T. A. MILU'TIN. 2,103,588

BRAKE ADJUsTrNG TOOL Filed July, 1935 s sheets-'sheet 1 nb 'w 99INVENTOR.

ATTORNEYS.

@fifa 2 Dec. 2s, 1937. T, A Mmmm 2,103,688'

BRAKE ADJUSTING TOOL i Filed July 5, 1935 5 Sheets-Sheet 2 INVENTOR.

ATTORNEYS.

Patented Dec. 28, 1937 l Theodore A. Milutin, Dearborn, Mich. *o Y lApplication July 3, 1935, Serial `No.` 29,596

AA`1".Ulfiepresent*invention relates to devices or tools which areintendedv to 'be' used in the adjusting dfjthebrake's of motor vehicles.

"Among the objects of the inventionfis a device of this character whichmay be easily andV quick` ly securedto the wheel of a vehicle and theWheel r'otatedby means which indicates :the force required tocau'sesuchrotation Another objectis a device'of the kind indicatedwhich maybevused in succession on each of the wheels'ofthe'vehicle, and an accuratecom-l parison made of the amount of force necessary to rotate leach ofthem with the brakes applied.

*Another object is a device of the character indicated which may be usedon eitherthe right orrleftwheel'of a pair'without interfering with theaccurate comparison of the forcenecess'ary to Aturn the wheel. f f

Another objec'ztl is a device indicated which 2o I Other objects andadvantages will -be apparent tothose skilled in the art upon referencetothe following description and the accompanying drawings in which Figure`1 is a plan view of the device aixed tOaLVehicle' wheel only vpart ofvwhich is shown in AE1liigureZis an elevation of the device in posi-y 30tiontouse 'on'l a wheel with part of the latter lcnolkeri/away. f' f I'E lFigurej isa side elevation of the deviceas shown i'nFigure 2.

"Figure 14 y is a'f'sectional view taken on the line- 3-51 l2-#f Figures. `1 f 'Figure 5ji`s asectional detail view of the loading spring.

J'Figure 5a is asimilar view'to Figure 5 but with parts in a differentposition. .lo Figradis a sectional View taken on the line 6,.-6bfFigurefrz 1 i v Figure"'7 is a yparfal sectional view' takenon the'line' l1-1ofr1igur e 3. ,Figure 8 is a section line8`'8 of Figure 4. Qisalslectionai view' of the gaugev taken .i 9 L' f.

tIf Fig',urg'e'f 11`jjisV a :verticalvcentral sectional view 11. i. r.,i

uref` lisis' anv enlargement of a portion of Magasin.; 3-

shall be simple'in construction'and eflicientin its Figure 14 is apartial'view'v of a modified form of the wheel embracing portion.

Figure 15 isa sectional view of a modified form of resilient resistanceMusing air as the resilient means.

Referring particularly to Figures l to 4, it will be noted that thedevice comprises a yoke portion having its'ends 2| curved to fit overthev tread off'a tir`e"22 and'mounted'on a suitable Wheel 23,-and'one or:both of the yoke arms mayA be provided with means foradjusting the yokelength andV permitting the clamping of the yoke onthe wheel. Suchadevice is indicated asav whole at24. The preferred form of thisadjusting means consists of a rack formed on one of the curvedendfpieces Y2| sliding within the tubular body of the yoke andcooperating with a gear 26-V carried ona suitable shaft-provided with ahexagonal 'extension 21 by means of whichy the Agear may be rotated. Y

As shown in Figure 7, the gearv 26 is maintained against rotation in onevdirection by means of a spring-pressed pawl member 28 pivoted at 26 andserving as a Aguard therefore,l Reference to Figure '7 which shows a'section of the deviceon an enlargedscale-shows that-the gear 26 willeasily rotate in! the directionproviding inward movement of the part2|but prevent outward movement thereof f unlessv 'thefpawl 28 is lifted.

At the central 3portion of 'the yoke, 20, which may be bowedlo'utwardlyin order not to interfere with the wheel hub, isxed, preferably byweldingfa circular bearing plate- 35, notched as at 31 (see Fig. 4) andhaving-a central stud 36 on which is'"rotatab1y mounted an anchor plate38 on the f underside of which is pivoted as at 39 a two-way pawl 40.This pawlillllris-held in one of the notches 31 by a suitable'spring 4|mountedv under compression `in linewith' thefpivot 39 and carriedbetween the pin 42 formed on the pawl, and a suitable, abutment 43. v Itis, furthendesirable to interpose betweenv plates andl 38 a brassbearing. plate 44, which KVmay be fixed to plate `38 and cut away toallow the pawl action.

Alsol rotatably mounted on stud 36 is a crank member comprising a flat.lever portion provid-f ed with a suitable Ahandle 5l.l Crank 50 may bemaintained on the ystud by means of suitable nuts 52a. Whilethe. crank50 is so mounted as to be moved relatively to plate 38, it is restrainedagainst suchmotionbya resilient element such as the spring deviceindicated at52 in Figures 1 and 2 and shown more in detail in Figures 5,5a,

suitable. dial 12a.

rod 54 is a spring 55 and slidably mounted on the rod 54 are twobushings 56 each having a flange 51 against which the spring ends abut.Carried by the plates 38 is another yoke 69 of which the arms embracethe two bushings 56 on the side of the flange 51 opposite the springV55.

Figures 2 andrG show best the connection of` the yoke 53 to the crankarm 50, and the provision for acsmallamount of rotative and lon;gitudinal movement.: In these figures'V it Ywill be noted that the arm5|] is provided with a rectangular slotY 50a in which a block 501) may:Yslide longitudinally. This block 50D is rotatably*v carried on a pin 53eriveted to the yoke 53Y and 1.

is bored and tapped to receive a screw v 50d serving tohold in place thecover plate 50e. The screw and plate Valso serve tohholdV these severalparts together.

Further, the yoke 53 preferably slides in 1a' suitable guide '53a cuttransverselyof the vend of plate 38, and the latter maybe folded back on.itself as shown Vat 38a inorder to increase itsstiffness in thisportion. v

It will readily be seen that any relative. motion betweenv the crank 5,0and the. plate 38 in either ,direction will tend to 'deform the resil,

ient resistance element, i. e, compress thev spring brake resistance. -1Y, Y. Y

Y Figure 5 shows `the several parts in .restlor central position, whileFigure 5a shows the parts after relative movement between the crank andplates. 1. Y. Y

Also carried on crank` arm` 5|) is a small plate 66, the edge of whichtowardthe stud 36.is`pro vided with Vgear teeth as,Y shown in -Figure 9at 61. This portionv61 of an internal gear or curved rackV will have itscenter at `the. center of the s`tud';36, and cooperates with a smallgear 68 forming a part oflagauge 65 carried by plate 33. asindicatedclearly in Figs. 9.and 10, so that any relative movement between the arm50 and the plate 38 will'be indicated. Y

In Figure 'l the pawlY 40 and the with suitable covers 68 and`69. Y l

The gauge constructionisshown more par- Vti'cularlyin Figures9'to `13rand in these figures there :is Yshown a framehor housing V1|) having a,t'opV plate.1| upon whichV may be mounted a This plate .1| is perforatedat its center and through the perforation exfA tends afshaft 12 carryinga hand 13 and tele-l scoped within a hollow shaft or sleeve A14 alsocarrying a hand 15. Both the shaft 12 and the sleeve 14 are providedwith a discV portion at. their Vlower vends, vthese being numbered 16andY 11 respectively,while 'the shaftr12 isprovided lwithzalowerextension 18- having a bearing within a cup member 19 fixed 'in-"a1base. plate 19a upon'which the housing 10 is Ysuitablyv mounted.- 1 s 3,

Also surrounding thesleeve V14 Yandgshaft12 isa brake 'disc 80 carriedon the end of a leverV arin` 8|, whichV arm is pivoted at V82 to theplate 1|, and-`operable, byk means'of a button 83, against a'spring 84.This brake discA 8U is'v adapted to press lthe twoY disc portions' 16and 11 VVtogether' and'hold theni'through friction against turning.

Each of the two disc portions 16 vand 11 is1 provided with a laterally'e'xtendingfarm 16de-f. 11arrespectively,the `'two arms 'Nue-:11a beingspringr65 and itsV allied parts are shown asbeing provided tween its twoarms a rod 54. Surrounding theV at their .outerY ends attached to thetwo ends Y 68'having xed thereto aism'alliinger 92 which lies betweenthe two arms. It will bereadily seen that rotation of the gear 68 inYclockwise direction (Figure 12) will move arm 11a and A".thereforetheindicating hand 13, whereas rotation inV the opposite Vdirection willmove the arm 16a andtherefore the hand 15 thereby indi- Hcasting notonly the amount but the direction ot vmovement. In idle position the twoarms rest against a `suitable stop 93. When either hand has been moved,the pressureofthe brake disc 80 will maintain Vit in indicating positionagainst the pull Aof spring, 99, but upon the 'release' by means of thebutton83, thehand will immediately turn backto! zero position asim'iicatedv in Figurefli). u

.In place of the spring device 52 and the gauge. 65 the resilientdevicemay beV pneumatic as shownin Figure andthe developedair pres'- sureindicated on a conventional pressure gauge of the type used forindicating tire pressures. As

indicated in Figure l5 this form ofrdevice may comprisevv a barrelVfixed to plate 38Y in any suitable fashion and carrying a V*boss |26upon which is'mounted algauge |21. VThe barrel |25 will beclosed atboth-.ends withY the heads `|28 which Awllnbe provided centrally; withpassages for a through piston rod |29 and suitable glands |30.A .Thepiston rod willlbe carried by aV yoke |3| mounted in suitable fashion oncrank arm 5|) as has already been described for the mount ing of yoke53. Y Y

VAt the center of rod |29, is a two way piston |3| and in each head V|28is a passage |32 connected to a longitudinal passage |33Aformed in theouter portion ofY barrel |25. This passage |33 is providedat itsYmidportionr'at therbase of boss |26 with a valve Vchamber |34. fromwhich, at the bottom, leads Ya vent opening |35. From. the topV of thechamber |.34` a passage |36 leads upthroughfboss |26 to the gauge|211and between the chamber |34 and gauge |21 a small inlet valve |31 islocated.l Operating in chamber |34 is avalvemember 38 which in thepositionY shown connects the right hand endof the barrel with thegaugeiand connects the leftl hand end of the barrel with the vent |35.-n its other positionV the valve Vreverses theseA connections. Y

. VIn .the v.use of this devicarit'is preferred to always llthecompression end of. the barrel by moving. the piston to the otherendbefore compression. This will resultin moreaccrate.

comparativepressure readings. 1

In operating theudevice forv brake adjustment, it will of course benecessary toA apply! the brakes with a suitable` pressureandmaintain..thatV pressure constant Awhile the testing and adjustment isaccomplished. This may bef done through the use oi'anyV suitablepressure Vhold;

ing means. Y Y Y n 'The pawl 40 is then'V moved toprevent "rotation ofthe plate 38` in the forward direction 'of the wheel and force isapplied to the crank in a direction to cause such wheel r0tat1'o`n'.'75k

With the brakes applied, there will of course be considerable resistanceto such turning and s uch resistance will be indicated by the gauge 65on the dial 12. The operator then applies the tool `to the oppositewheel and by reversing the p-awl may reverse the direction of forceapplicationon crank 50, so as to indicate the amount of force requiredtov overcome brake resistance on that wheel, the amount of force beingindicated on the dial by the other of the two hands. He may then adjustthe brakes on the two wheels so that they will be equal in brakingaction. In order to prevent rocking of theyoke member 20 on the wheelperiphery suitable pads 99 may be provided near the ends of the yoke.

A somewhat modified form of the tool is shown in Figure 14. In this formthe yoke 20a is shown as provided with both ends adjustable, one endthrough the movable pin Zia and perforated shank 2 Ib entering thetubular arm of yoke Za,

and the other end through a suitable contracting means such as isindicated in Figure 7. In this form also the two curved ends 22a areshown as removable. l

Now having described the invention and the preferred embodiment thereof,it is to be understood that said invention is toberlimited, not to thespecific details herein set forth, but only by the scope of the claimswhich follow:

What I claim is:

1. A vehicle brake testingV tool for indicating the braking effect upona wheel, comprising a contractible yoke adapted to span the wheel andgrip the periphery thereof, a rigid arm rotatably mounted on said yokenear the center thereof, reversible ratchet means connected Jdherewithfor prevention of rotation of said arm in a selected direction whileallowing rotation in the opposite direction, crank means also yrotatablymounted on said yoke and concentric with said arm, a second yoke carriedby said crank means, resilient means embraced by said second yoke,

and abutments carried by said arm and against v which said resilientmeans acts to resist relative movement of said crank and arm, and meansto indicate the force required to deform said resilient means andproduce such relative'movement.

2. A vehicle brake testing tool for indicating` the braking effect upona wheel, comprising a contractible yoke adapted to span the Wheel andgrip the periphery thereof, a rigid arm rotatably mounted on said yokenear the center thereof, reversible ratchet means connected therewithfor prevention of rotation of said arm in a selected direction whileallowing rotation in the opposite direction, crank means also rotatablymounted on said yoke and concentric with said arm, a second yoke carriedby said crank means, resilient means embraced by said second yoke, andabutments carried by said arm and against which said resilient means`acts to resist relative movement of said crank and arm, and means toindicate the force required to deform said resilient means and producesuch relative movement, said indicating means also indicating thedirection of relative movement.

3l. A gauge for indicating relative movement of two elements comprisinga rack on one of said elements, a framecarried by the other of, Vsaidelements and supporting a gear meshing with said rack, a pair of handsupporting members rotatably mounted on said frame, each of said membersincluding a projecting portion, a nger carried by said gear and adaptedto c oact with and move said lprojecting portions alternativelydepending upon the direction of rotation of said gear by said rack, anda dial for indicating the amount of movement.

4. In a gauge for indicating relative movement of two elements, one ofsaid elements having mounted thereon a frame including a plate, a dialthereon, said plate providing at its central portion a bearing, a hollowshaft in said bearing, said shaft having at its upper end an indicatinghand, and at its lower end a disc portion, a second shaft having abearing within the first and also provided at its top with an indicatinghand and near its lower end with a disc portion contacting with thefirst such portion, means to rotate one of said yhands in accordancewith said relative movement in one direction and to rotate the other ofsaid hands in accordance with relative movement in the `other direction,and means coacting with said disc portions to maintain said hands fixedat the end. of such rotation.

THEODORE A. MILUTIN.

